firmware: arm_ffa: Add support for querying FF-A features

Add support for FFA_FEATURES to discover properties supported at the
FF-A interface. This interface can be used to query:
 - If an FF-A interface is implemented by the component at the higher EL,
 - If an implemented FF-A interface also implements any optional features
   described in its interface definition, and
 - Any implementation details exported by an implemented FF-A interface
   as described in its interface definition.

Link: https://lore.kernel.org/r/20220907145240.1683088-5-sudeep.holla@arm.com
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 04e7cbb1b9aa5a763a3e0f7b455bee51ddfc5fe9..81b8d578b6eacbff6476e82ac08aeee7f99c98f6 100644 (file)
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -571,6 +571,32 @@ static int ffa_memory_reclaim(u64 g_handle, u32 flags)
        return 0;
 }
 
+static int ffa_features(u32 func_feat_id, u32 input_props,
+                       u32 *if_props_1, u32 *if_props_2)
+{
+       ffa_value_t id;
+
+       if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
+               pr_err("%s: Invalid Parameters: %x, %x", __func__,
+                      func_feat_id, input_props);
+               return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
+       }
+
+       invoke_ffa_fn((ffa_value_t){
+               .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
+               }, &id);
+
+       if (id.a0 == FFA_ERROR)
+               return ffa_to_linux_errno((int)id.a2);
+
+       if (if_props_1)
+               *if_props_1 = id.a2;
+       if (if_props_2)
+               *if_props_2 = id.a3;
+
+       return 0;
+}
+
 static u32 ffa_api_version_get(void)
 {
        return drv_info->version;